Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d4cf1bb7a7414f…

MALICIOUS

PDF

36.5 KB Created: 2020-05-23 07:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29cbd524c3e85610973bd16384d1432f SHA-1: d12f703c25eeec609ac3001e189589ca0d1cf9b7 SHA-256: b8d4cf1bb7a7414fe4d264e4b7313661345ba5d8fd2b972940b41c4a3ea04a10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains text related to 'classroom signs and labels' and includes URLs that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a multitude of external sites, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://templestoweroofing.com/uploads/1/3/0/6/130604838/130604838.html#free+printable+classroom+signs+and+labels
    • http://androft.com/uploads/1/3/0/3/130379078/naviz.pdf
    • http://new-life-counseling.org/uploads/1/3/0/2/130270776/kekepu_wabulo.pdf
    • http://munengsocietya.com/uploads/1/3/1/3/131380433/85eae6a295.pdf
    • http://lucyrussell.org/uploads/1/3/1/4/131437298/zoweriritegasopu.pdf
    • http://digcitkids.net/uploads/1/3/0/7/130775111/2877505.pdf
    • http://strokeawarenessandrecovery.com/uploads/1/3/0/5/130589194/kamanekakegozowaribu.pdf
    • http://missiescompletebeverageandbartendingservice.com/uploads/1/3/0/2/130272102/begedapemod.pdf
    • http://albertvilletravel.com/uploads/1/3/0/8/130873828/vafof.pdf
    • http://plantimony.com/uploads/1/3/0/6/130639099/5452887.pdf
    • http://unioncountyattorneys.com/uploads/1/3/1/4/131453531/najorobexaliwi.pdf
    • http://lspdoffical.net/uploads/1/3/1/4/131407163/vesedimak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625c.bin
7ae1dabbf6394957acee7ecadfeee7295fe7c21f39c6ffa0d9837c8373c5a6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625C 10572 bytes

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